EP3517228A1 - Règles d'un processus de laminage - Google Patents

Règles d'un processus de laminage Download PDF

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Publication number
EP3517228A1
EP3517228A1 EP18153836.4A EP18153836A EP3517228A1 EP 3517228 A1 EP3517228 A1 EP 3517228A1 EP 18153836 A EP18153836 A EP 18153836A EP 3517228 A1 EP3517228 A1 EP 3517228A1
Authority
EP
European Patent Office
Prior art keywords
lubricant
rolling
rolling stock
advance
roll
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP18153836.4A
Other languages
German (de)
English (en)
Inventor
Martin Bergmann
Konrad Krimpelstaetter
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Primetals Technologies Austria GmbH
Original Assignee
Primetals Technologies Austria GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Primetals Technologies Austria GmbH filed Critical Primetals Technologies Austria GmbH
Priority to EP18153836.4A priority Critical patent/EP3517228A1/fr
Priority to US16/963,176 priority patent/US11565293B2/en
Priority to CN201880088108.7A priority patent/CN111629843B/zh
Priority to PCT/EP2018/083787 priority patent/WO2019145079A1/fr
Publication of EP3517228A1 publication Critical patent/EP3517228A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/58—Roll-force control; Roll-gap control
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B27/00—Rolls, roll alloys or roll fabrication; Lubricating, cooling or heating rolls while in use
    • B21B27/06—Lubricating, cooling or heating rolls
    • B21B27/10—Lubricating, cooling or heating rolls externally
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2265/00—Forming parameters
    • B21B2265/12—Rolling load or rolling pressure; roll force
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2265/00—Forming parameters
    • B21B2265/20—Slip
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2275/00—Mill drive parameters
    • B21B2275/02—Speed
    • B21B2275/04—Roll speed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2275/00—Mill drive parameters
    • B21B2275/02—Speed
    • B21B2275/06—Product speed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2275/00—Mill drive parameters
    • B21B2275/10—Motor power; motor current
    • B21B2275/12—Roll torque
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
    • B21B45/0239—Lubricating
    • B21B45/0245—Lubricating devices
    • B21B45/0248—Lubricating devices using liquid lubricants, e.g. for sections, for tubes
    • B21B45/0251—Lubricating devices using liquid lubricants, e.g. for sections, for tubes for strips, sheets, or plates

Definitions

  • the invention relates to a method and an apparatus for controlling a rolling process, in which a rolling stock is rolled in a nip between two work rolls of a rolling stand.
  • the rolling stock before the nip has a smaller and behind the nip a greater speed than the roll surfaces of the work rolls of the mill stand.
  • the neutral point is also referred to as a flow sheath.
  • the location of the neutral point is important to the rolling process because the rolling process tends to become unstable and slippage of the rolling stock may occur in the nip if the neutral point is too close to the exit position where the rolling stock exits the mill stand
  • friction losses due to the friction between the roll surfaces and the rolling stock increase with increasing distance of the neutral point from the exit position.
  • DE 10 2005 059 653 A1 discloses a method for controlling a rolling process in which a metal strip is rolled flat.
  • the size of the plane yield stress of the metal strip and the magnitude of the hydrostatic pressure in the neutral point are estimated from measurable process parameters.
  • the position of the neutral point is calculated on the basis of the estimated quantities, a first group of the measurable process parameters as well as the plane modulus of elasticity and the compressibility of the metal strip, and the rolling process is adjusted according to the position of the neutral, if necessary Point stabilized by intervention with appropriate measures.
  • EP 2 651 577 B1 discloses a method and a device for applying a lubricant during rolling of metallic rolling stock, in particular a rolled strip guided in a nip between two work rolls.
  • the doctrine of EP 2 651 577 B1 provides to produce a mixture of lubricant and a carrier gas in a sputtering device and to apply by means of spray nozzles on the surface of at least one work roll and / or on the surface of the rolled strip.
  • EP 2 893 986 A1 discloses a method and apparatus for applying a lubricating oil when rolling a metallic flat stock in a rolling stand.
  • the lubricating oil is atomized by means of compressed air in mixing chambers of spray nozzles to form an aerosol and sprayed with the spray nozzles on the rolling stock and / or at least one roller of the roll stand.
  • WO 2007/025682 A1 discloses a method for lubricating and cooling rolls and metal strip when rolling metal strips, wherein on the inlet side a minimum amount of pure lubricant without high water content with controlled viscosity depending on various process data is continuously metered online dosed on a physical computing model and on the outlet side Coolant is applied by spraying.
  • EP 0 054 172 A2 discloses a method for rolling stress-free rolled strip by influencing the coefficient of friction between the strip surfaces and the roll barrel envelope surfaces depending on partial tensile stresses determined downstream of the last frame in the transverse direction of the strip, wherein the shell surfaces of the roll bale of the work rolls and / or the roll nip with roll emulsion be charged.
  • base oil of the emulsion is applied directly to the belt surface prior to entry of the belt into the nip in amounts and localized areas determined by the measured partial tensile stresses.
  • the invention has for its object to provide a method and apparatus for controlling a rolling process, which are improved in particular with regard to the position of the neutral point.
  • the object is achieved by a method having the features of claim 1 and by a device having the features of claim 12.
  • a rolling process is regulated, in which a rolling stock is rolled in a nip between two work rolls of a rolling stand.
  • a Voreilungssollwert be given for a lead of the rolling stock and a Voreilungsistwert the lead of the rolling stock determined.
  • the lead of the rolling stock is controlled to the advance target value by applying a lubricant lubricant rate to the rolling stock and / or to at least one work roll depending on the actual advance value and the advance target value.
  • f denotes the lead
  • v 1 denotes the exit speed of the rolling stock behind the roll stand
  • v N denotes the roll speed of a roll surface of a work roll with which the rolled stock is rolled.
  • the terms "before” and “behind” the rolling stand or nip refer to a Rolling direction in which the rolling stock is passed through the nip.
  • a lubricant rate is understood to be a quantity of lubricant per unit of time.
  • the invention makes use of the fact that the lead defined by equation [1] is a measure of the position of the neutral point. The closer the neutral point is to the exit position of the rolling stock, the smaller is the lead. Negative values of the overfeed signal slippage of the rolling stock in the nip. By means of the regulation according to the invention of the overfeed, therefore, the position of the neutral point can be optimized and slippage of the rolling stock can be detected or slippage counteracted.
  • the use of the lead as a control variable also has the advantage that the lead can be determined in a simple and reliable manner, since the exit speed of the rolling stock and the roller speed of a work roll can be determined easily and directly.
  • An embodiment of the invention accordingly provides that the exit speed of the rolling stock is measured behind the roll stand, a roll speed of a roll surface of a work roll is determined and the Voreilungsistwert according to equation [1] from the exit velocity and the roll speed is determined.
  • the invention also makes use of the fact that the advance or the position of the neutral point can be changed by a variation of a lubricant rate applied to the rolling stock and / or to at least one work roll.
  • the lubricant affects the friction between the work rolls and the rolling stock.
  • the change in the lubricant rate therefore changes the friction between the Work rolls and the rolling stock and thereby causes a shift of the neutral point.
  • the control of the advance by the change in the lubricant rate also allows optimized use of the lubricant during the rolling process, as the lubricant rate is not fixed or adjusted based on an uncertain mathematical rolling model of the rolling process, but depending on the direct measurements Advance actual value is set in order to regulate the overfeed to the overfeed setpoint.
  • the invention has the advantage that an optionally additionally used mathematical rolling model of the rolling process, which at the same time takes into account a multiplicity of process parameters (for example a rolling force distribution in the individual rolling stands of a rolling train, strip tensioning and / or reduction of stitches in the rolling stands), in order to obtain the desired rolled product generate, of the inventive control, which acts only on the lubricant system is not affected.
  • a multiplicity of process parameters for example a rolling force distribution in the individual rolling stands of a rolling train, strip tensioning and / or reduction of stitches in the rolling stands
  • the method according to the invention is also particularly suitable as a retrofit solution for existing rolling mills in order to increase the product quality without having to make any changes to the existing rolling model.
  • slippage in the method according to the invention can be detected reliably and in good time and slippage can be counteracted by a corresponding change in the lubricant rate.
  • An embodiment of the invention provides that approximately 0.05 is specified as the advance setpoint.
  • An advance set point of about 0.05 has been found to be advantageous, since at this value of the lead, the neutral point is close to the exit position of the rolling stock behind the nip, so that the friction losses are minimized in the nip, on the other hand still has a sufficient safety margin Neutral point from the exit position is present to prevent slippage of the rolling in the nip.
  • a further embodiment of the invention provides that a hysteresis interval is set for the advance and the lubricant rate is only changed when the actual advance value leaves the hysteresis interval.
  • an upper limit of the hysteresis interval is about 0.03 greater than the advance target value and / or a lower limit of the hysteresis interval is coincident with the overshoot target value. It is thereby achieved that intervention in the lubricant is only intervened when the actual advance value leaves the hysteresis interval so that the control does not become too restless.
  • a lower limit of the hysteresis interval corresponding to the advance target value is particularly advantageous if the advance target value corresponds to a position of the neutral point close to the exit position of the rolling stock behind the roll gap, since in this case falling below the advance target value will quickly lead to slippage of the rolling stock in the roll nip can.
  • overshooting of the advance target value by about 0.03 can generally be tolerated since this does not cause the friction losses in the roll gap to increase excessively.
  • a friction coefficient of a friction between the rolling stock and a work roll is determined and the lubricant rate is also applied as a function of the coefficient of friction, and / or that in the nip on the Walzgut acting rolling force is determined and the lubricant rate is also applied depending on the rolling force.
  • a further embodiment of the invention provides that for applying the lubricant rate, a mixture of lubricant and a carrier gas is generated and sprayed onto at least one work roll and / or in the nip.
  • This application of lubricant also referred to as minimum quantity lubrication, is advantageous because the direct application of pure lubricant into the nip or on the work rolls allows short reaction times for the control of the lead.
  • a lubricant-containing rolling emulsion can be produced and applied to the rolling stock and / or at least one work roll, and / or pure lubricant can be applied to the rolling stock before the roll gap and spaced from the roll gap.
  • a lubricant-containing rolling emulsion By applying a lubricant-containing rolling emulsion, the rolling stock and the work rolls can be additionally cooled.
  • the application of pure lubricant before the nip and from the nip spaced on the rolling stock is also referred to as direct application and allows a targeted improvement in the lubricating effect of the lubricant, but has due to the distance in which the lubricant is applied to the rolling stock before the nip, a greater reaction time for overfeed control than minimum quantity lubrication.
  • the overfeed determination device is preferably designed to measure an exit speed of the rolling stock behind the rolling stand and to determine a rolling speed of a roll surface of a work roll.
  • the lubricant dispenser is for example for producing a mixture of lubricant and a carrier gas and for spraying the mixture on at least one work roll and / or in the nip, and / or for producing a lubricant-containing rolling emulsion and for outputting the rolling emulsion on the rolling stock and / or at least one work roll, and / or set up to output pure lubricant to the rolling stock at a distance in front of the nip.
  • a control device makes it possible to carry out the method according to the invention.
  • the advantages of such a control device therefore correspond to the above-mentioned advantages of the method according to the invention.
  • FIG. 1 schematically shows a rolling stand 1, is rolled with a rolling stock 3, and a lubricant dispenser 5 for dispensing a lubricant.
  • the rolling stand 1 has two work rolls 7, which are spaced from each other by a nip 9.
  • the rolling stock 3 is formed as a metallic rolled strip, which is guided in a rolling direction 11 through the nip 9.
  • the two work rolls 7 rotate with the same amount, opposing angular velocities, so that their roll surfaces 13 have a roll speed v N whose direction coincides at the location of the nip 9 with the rolling direction 11.
  • the lubricant dispensing device 5 for example, a mixture of lubricant and a carrier gas can be generated and sprayed onto the work rolls 7 and / or in the nip 9.
  • the lubricant dispensing device 5 for example, a sputtering device in which the mixture can be produced, and a plurality of spray nozzles, with which the mixture can be dispensed on.
  • a lubricant-containing rolling emulsion can be produced with the lubricant dispensing device 5 and can be dispensed onto the rolling stock 3 or / and onto the work rolls 7.
  • lubricant dispensing device 5 alternatively or additionally, for example, pure lubricant before the nip 9 and spaced from the nip 9 can be output to the rolling stock 3.
  • FIG. 2 shows a diagram of a rolling stock speed v of the rolling stock 3 as a function of a rolling stock position x in the region of the roll gap 9.
  • the rolling stock 3 has an entry velocity v 0 .
  • the rolling stock speed v increases in the region of the nip 9 until it reaches an exit speed v 1 at an exit position x 1 behind the nip 9.
  • the rolling stock speed v assumes the value of the roller speed v N of the roller surfaces 13 of the work rolls 7 at a flow-dividing position x N defining the neutral point.
  • FIG. 3 shows a block diagram of a control loop for controlling the rolling process, in which the rolling stock 3 is rolled in the nip 9 between the work rolls 7 of the roll stand 1.
  • the rolling process is controlled by a control device including a lead detection device 15, the lubricant discharge device 5, and a control unit 17.
  • the control unit 17 is the controller of the control loop
  • the lubricant dispensing device 5 is the actuator of the control loop
  • the overfeed determination device 15 is the measuring element of the control loop and the rolling stand 1 and the rolling stock 3 form the controlled system 19 of the control loop.
  • the controlled variable of the control loop is the advance f of the rolling stock 3, which is formed according to equation [1] from the exit speed v 1 and the roller speed v N.
  • FIG. 2 shows that the lead f is a measure of the position of the neutral point. The closer the neutral point is to the exit position x 1 , the smaller the lead f is.
  • the lead f is therefore particularly suitable as a controlled variable for controlling the position of the neutral point.
  • an advance setpoint value f s is specified, to which the overfeed f is regulated. For example, about 0.05 is given as the advance setpoint value f s .
  • the overfeed determination device 15 is set up to measure the exit speed v 1 of the rolling stock 3 behind the nip 9 and to determine the roller speed v N.
  • the exit velocity v 1 is measured, for example, by means of at least one strip tension measuring roller, which is arranged behind the rolling stand 1 and rolls on a rolling stock surface of the rolling stock 3.
  • the exit velocity v 1 is measured optically, for example by means of a laser measurement.
  • the roll speed V N of a work roll 7 is determined, for example, from the angular velocity and the radius of the work roll 7, wherein the angular velocity is determined, for example, from a rotational speed of a work roll 7 driving motor.
  • a control difference is formed by subtracting the advance actual value f M from the advance target value f S.
  • the control unit 17 forms a control variable u dependent on the control difference, with which the lubricant dispensing device 5 is activated. From the lubricant dispenser 5 is used as a manipulated variable of the Control circuit outputs a dependent on the control quantity u lubricant rate u R of the lubricant, wherein the lubricant rate u R denotes a lubricant amount per unit time.
  • a hysteresis interval for the advance f is specified and the lubricant rate u R is changed only when the actual advance value f M leaves the hysteresis interval.
  • a hysteresis interval is specified whose upper limit is approximately 0.03 greater than the advance target value f S and whose lower limit agrees with the advance actual value f M.
  • the lubricant rate u R is additionally adjusted in dependence on at least one further parameter of the rolling process.
  • a friction coefficient of friction between the rolling stock 3 and a work roll 7 is determined, and the lubricant rate u R is also set depending on the friction coefficient.
  • a rolling force acting on the rolling stock 3 in the roll gap 9 is determined as a further parameter, for example, and the lubricant rate u R is also set as a function of the rolling force.
  • the friction coefficient and / or the rolling force are determined, for example, by means of a roll gap model in real time from current process variables of the rolling process.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metal Rolling (AREA)
  • Control Of Metal Rolling (AREA)
EP18153836.4A 2018-01-29 2018-01-29 Règles d'un processus de laminage Withdrawn EP3517228A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP18153836.4A EP3517228A1 (fr) 2018-01-29 2018-01-29 Règles d'un processus de laminage
US16/963,176 US11565293B2 (en) 2018-01-29 2018-12-06 Regulating a rolling process
CN201880088108.7A CN111629843B (zh) 2018-01-29 2018-12-06 对于轧制过程的调节
PCT/EP2018/083787 WO2019145079A1 (fr) 2018-01-29 2018-12-06 Réglage d'un processus de laminage

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP18153836.4A EP3517228A1 (fr) 2018-01-29 2018-01-29 Règles d'un processus de laminage

Publications (1)

Publication Number Publication Date
EP3517228A1 true EP3517228A1 (fr) 2019-07-31

Family

ID=61074378

Family Applications (1)

Application Number Title Priority Date Filing Date
EP18153836.4A Withdrawn EP3517228A1 (fr) 2018-01-29 2018-01-29 Règles d'un processus de laminage

Country Status (4)

Country Link
US (1) US11565293B2 (fr)
EP (1) EP3517228A1 (fr)
CN (1) CN111629843B (fr)
WO (1) WO2019145079A1 (fr)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0054172A2 (fr) 1980-12-12 1982-06-23 Sms Schloemann-Siemag Aktiengesellschaft Procédé et installation pour le laminage d'une bande détensionnée
WO2005065854A1 (fr) * 2003-12-23 2005-07-21 Sms Demag Ag Procede de lubrification de produits a laminer
WO2007025682A1 (fr) 2005-09-02 2007-03-08 Sms Demag Ag Procede pour lubrifier et refroidir les cylindres et la bande metallique lors du laminage, notamment lors du laminage a froid de bandes metalliques
DE102005059653A1 (de) 2005-12-14 2007-06-21 Sms Demag Ag Verfahren und Computerprogramm zum Steuern eines Walzprozesses
EP2651577B1 (fr) 2010-12-16 2015-01-28 Siemens VAI Metals Technologies GmbH Procédé et dispositif pour répandre un lubrifiant lors du laminage d'un produit laminé métallique
EP2893986A1 (fr) 2014-01-08 2015-07-15 Siemens VAI Metals Technologies GmbH Lubrification à l'aide de buses d'injection dotées de plusieurs orifices d'entrée d'huile
KR20160101153A (ko) * 2013-12-24 2016-08-24 아르셀러미탈 열간 압연 방법

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU2003271465A1 (en) * 2002-09-18 2004-04-08 Avestor Limited Partnership Lamination process and apparatus for alkali metals or alloys thereof
JP4505231B2 (ja) 2004-01-21 2010-07-21 新日本製鐵株式会社 冷間圧延における潤滑油供給方法
JP4355279B2 (ja) 2004-11-22 2009-10-28 新日本製鐵株式会社 冷間圧延における潤滑油供給方法
US20070068210A1 (en) * 2005-09-29 2007-03-29 University Of Pittsburgh - Of The Commonwealth System Of Higher Education System for controlling a rolling mill and method of controlling a rolling mill
CN102207439B (zh) 2011-03-18 2012-12-05 东北大学 一种模拟轧制过程轧辊和轧件摩擦磨损的实验设备
US9095886B2 (en) * 2011-06-27 2015-08-04 University Of Central Florida Research Foundation, Inc. Mill control system and method for control of metal strip rolling
CN104801548B (zh) 2014-01-27 2017-01-25 宝山钢铁股份有限公司 一种热连轧穿带过程中自动改善带钢秒流量平衡的方法

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0054172A2 (fr) 1980-12-12 1982-06-23 Sms Schloemann-Siemag Aktiengesellschaft Procédé et installation pour le laminage d'une bande détensionnée
WO2005065854A1 (fr) * 2003-12-23 2005-07-21 Sms Demag Ag Procede de lubrification de produits a laminer
WO2007025682A1 (fr) 2005-09-02 2007-03-08 Sms Demag Ag Procede pour lubrifier et refroidir les cylindres et la bande metallique lors du laminage, notamment lors du laminage a froid de bandes metalliques
DE102005059653A1 (de) 2005-12-14 2007-06-21 Sms Demag Ag Verfahren und Computerprogramm zum Steuern eines Walzprozesses
EP2651577B1 (fr) 2010-12-16 2015-01-28 Siemens VAI Metals Technologies GmbH Procédé et dispositif pour répandre un lubrifiant lors du laminage d'un produit laminé métallique
KR20160101153A (ko) * 2013-12-24 2016-08-24 아르셀러미탈 열간 압연 방법
US20160318080A1 (en) * 2013-12-24 2016-11-03 Arcelormittal Hot Rolling Method
EP2893986A1 (fr) 2014-01-08 2015-07-15 Siemens VAI Metals Technologies GmbH Lubrification à l'aide de buses d'injection dotées de plusieurs orifices d'entrée d'huile

Also Published As

Publication number Publication date
US20210129199A1 (en) 2021-05-06
CN111629843B (zh) 2022-05-03
WO2019145079A1 (fr) 2019-08-01
US11565293B2 (en) 2023-01-31
CN111629843A (zh) 2020-09-04

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